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TUBING AND CASING COUPLING
TUBING AND CASING COUPLING
TUBING AND CASING COUPLING
TUBING AND CASING COUPLING
TUBING AND CASING COUPLING
TUBING AND CASING COUPLING
TUBING AND CASING COUPLING
TUBING AND CASING COUPLING

TUBING AND CASING COUPLING

Casing coupling is a short pipe applied in connecting two casing pipes which have threads. The pipe coupling has internal threads machined to match the external thread of the long joints of casing.
Thread Type:NUE/EUE/STC/LTC/BTC
Grade:J55, L80, N80 & P110
Product introduction
Technical DATA
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Product introduction
Keywords:Casing and Tubing Coupling, Casing Coupling, Tubing Coupling
Type:API 5CT Tubing Couplings, API 5CT Casing Couplings
Size:Tubing Coupling : 1.9'' - 4-1/2'',Casing Couping : 4-1/2'' - 13-3/8''
Thread Type:NUE/EUE/STC/LTC/BTC
Grade:J55, L80, N80 & P110
Standard:API 5CT and 5B PSL1/PSL2 J55,K55,N80-1,N80-Q, API 5CT and 5B L80-1,C90, C95,T95, P110, Q125
Surface Treatment :phosphating treatment
Color Code:J55 Green,L80 Red with brown strips,N80 Red with green strips,P110 White

Description
Casing coupling is a short pipe applied in connecting two casing pipes which have threads. The pipe coupling has internal threads machined to match the external thread of the long joints of casing. The two joints of casing pipes are screwed into opposite ends of the casing coupling. Through their strength can be normally made of the same grade of steel as the casing. All casing couplings are manufactured in accordance with API 5CT specification of the latest edition.

Properties of Casing Couplings:
♦ The material of casing couplings is H40, J55, K55, M65, N80-1, N80Q, L80, C95, T95 and P110 grade steel with high quality and good performance;
♦ The outer diameter ranges from 127mm to 365.12 mm;
♦ The casing couplings thread patterns include short round thread, long round thread and buttress thread.
Tubing coupling is a kind of drilling tool available in oil field. Tubing couplings are mainly used in connecting oil pipes. This type of pipe coupling has handled the problem that the existing couplings tend to crack because of stress concentration. The oil pipe ends and the inner wall of the tubing coupling are connected by threads. And the oil pipes and the ends of the tubing coupling have the same type of threads. It is not easy to crack for this type of connection and the connection effect is good. The tubing coupling can avoid the oil well string dropout accident effectively.

Properties of Tubing Coupling:
♦ The material of tubing couplings is H40, J55, N80-1, N80Q, L80, C90, T95 and P110 grade steel with high quality and good performance;
♦ It is mainly used to connect two oil pipes;
♦ The tubing coupling thread patterns include non-upset thread and upset thread;
♦ The outer diameter of tubing coupling ranges from 55.88 mm to 141.3 mm;

API Tubing Coupling
Specification    
Size (Pipe OD) (in)   1.900, 2-3/8, 2-7/8, 3-1/2, 4, 4-1/2
Upset   Non UpsetExternal Upset
Grade   J-55, C-75, L-80, N-80, C-95, P-110
Option   Electro-zinc platedPhosphorised

API Casing Coupling
Specification  
Size (Pipe OD) (in) 4-1/2, 5, 5-1/2, 6-5/8, 7, 7-5/8, 8-5/8, 9-5/8, 10-3/4, 11-3/4, 13-3/8, 16, 18-5/8, 20
Threading Short Round-Thread Casing (STC)Long Round-Thread Casing (LC)Buttress Thread Casing (BC)
Grade H-40, J-55, K-55, C-75, L-80, N-80, C-95, AS-95, P-110, L80-13CR
Technical DATA
API Tubing Coupling
Descriptions and size Type of Thread O.D*L Weight
(mm) (kg)
Tubing Coupling 1.05 NUE 33.35*80.96 0.23
1.05 EUE 42.16*82.55 0.38
1.315 NUE 42.16*82.55 0.38
1.315 EUE 48.26*88.90 0.57
1.66 NUE 52.17*88.90 0.59
1.66 EUE 58.88*95.25 0.68
1.9 NUE 55.88*95.25 0.56
1.9 EUE 63.50*98.42 0.84
2-3/8″ NUE 73.02*107.95 1.28
2-3/8″ EUE 77.80*132.82 1.55
2-7/8″ NUE 88.90*130.18 2.34
2-7/8″ EUE 93.17*133.35 2.4
3-1/2″ NUE 107.95*142.88 3.71
3-1/2″ EUE 114.30*146.05 4.1
4″ NUE 120.65*146.05 4.35
4″ EUE 127.00*152.40 4.82
4-1/2″ NUE 132.08*155.58 4.89
4-1/2″ EUE 141.30*158.75 6.05
 
API Casing Coupling
Descriptions and size Type of Thread O.D*L Weight
(mm) (kg)
Casing Coupling 4-1/2″ STC 127.00*158.75 5.23
4-1/2″ LTC 127.00*177.80 4.15
4-1/2″ BTC 127.00*225.42 4.55
5″ STC 141.30*165.10 4.66
5″ LTC 141.30*196.85 5.75
5″ BTC 141.30*231.78 5.85
5-1/2″ STC 153.67*171.45 5.23
5-1/2″ LTC 153.67*203.20 6.42
5-1/2″ BTC 153.67*234.95 6.36
6-5/8″ STC 187.71*184.15 9.12
6-5/8″ LTC 187.71*222.25 11.34
6-5/8″ BTC 187.71*244.48 11.01
7″ STC 194.46*184.15 8.39
7″ LTC 194.46*228.60 10.83
7″ BTC 194.46*254.00 10.54
7-5/8″ STC 215.90*190.50 12.3
7-5/8″ LTC 215.90*234.95 15.63
7-5/8″ BTC 215.90*263.52 15.82
8-5/8″ STC 244.48*196.85 16.23
8-5/8″ LTC 244.48*254.00 21.67
8-5/8″ BTC 244.48*269.88 20.86
9-5/8″ STC 269.88*196.85 18.03
9-5/8″ LTC 269.88*266.70 25.45
9-5/8″ BTC 269.88*269.88 23.16
10-3/4″ STC 298.45*203.20 20.78
10-3/4″ BTC 298.45*269.88 25.74
11-3/4′ STC 323.85*203.20 22.64
11-3/4′ BTC 323.85*269.88 28.03
13-3/8″ STC 365.12*203.20 25.66
13-3/8″ BTC 365.12*269.88 31.77
16″ STC 431.80*228.6 34.91
16″ BTC 431.80*269.88 40.28
18-5/8″ STC 508.00*228.60 51.01
18-5/8″ BTC 508.00*269.88 62.68
20″ STC 533.40*228.6 43.42
20″ LTC 533.4*292.10 57.04
20″ BTC 533.40*269.88 50.1
Standard
Applicable standards:
API 5CT material for body;
API 5B for API threads;
Premium thread per licensor specifications
Main Technical parameters
 Couplings Size in Max. OD in(mm) Min length in(mm) Grade
    NU EU NU EU  
  23/8 2.875(73.03) 3.063(77.80) 41/4(107.95) 47/8(123.83) J55
N80
L80
  27/8 3.500(88.90) 3.668(93.20) 51/8(130.18) 51/4(133.35)  
  31/2 4.250(108.00) 4.500(114.30) 55/8(142.88) 53/4(146.05)  
Crossovers J55,N80,L80                All kinds of crossovers, connections and sub-couplings of grades J55, N80 and L80

COUPLING PIPE GRADE IDENTIFICATION BY PAINT COLOR
According to API 5CT standards, Oil casing and Tubing couplings should be painted one by one to distinguish different grades of steel. The color label of the oil casing and Tubing should be sprayed at any end ≥ 600mm, and the color should be painted on the whole outer surface, and then the color ring should be sprayed.
Grade Grade Type Colour(s) for Coupling Number andcolour of bandsfor product
EntireCoupling Band(s)
H40   None Same as for pipe None/black band at the manufacturer’s option
J55 Tubing   Bright Green None One Bright Green
J55 Casing   Bright Green One White One Bright Green
K55   Bright Green None Two Bright Green
M65   M65Pipe uses L80Type 1Couplings One Bright GreenOne Blue
N80 1 Red None One Red
N80 Q Red One Green One RedOne Bright Green
R95   Brown None One Brown
L80 1 Red One Brown One RedOne Brown
L80 9Cr None Two Yellow One Red,One Brown,Two Yellow
L80 13Cr None One Yellow One Red,One Brown,One Yellow
C90 1 Purple None One Purple
T95 1 Silver None One Silver
C110   White Two Brown One White,Two Brown
P110   White None One White
Q125   Orange None One Orange












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